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RavenTMTrim

Superior rAVeN TM CoNCepT

proVeN Superior TeChNology

The RAVENTM Control Valve was developed by highly experienced

engineers who took the well-proven labyrinth disc stack type o trim

and introduced two main patented innovations: resistance to the

eects o blockage and reduction in noise. The innovative designs

give this well-established technology or severe service applications

even more technical advantages over other currently available trim

designs.

reS iSTANCe To The e ffeCTS of BloCkAge

The expanding passage design, combined with multiple entry points

to the individual ow passages, make blockage very unlikely. Unlike

conventional labyrinth trim designs, RAVENTM has relie points

built into the labyrinth design. Under normal operation, these relie

points have virtually no ow through them. In the event o blockage,

the relie points are utilized. Extensive testing has shown that i a

blockage occurs in RAVENTM trim, all inlet ports and outlet ports

are still utilized, minimizing any reduction in Cv and ensuring that

the minimum designed number o pressure reducing stages are

still used. In conventional labyrinth stack designs, a blockage in the

stack eliminates the Cv o that path completely and in the case o a

partial blockage, can actually generate noise.

CuSToM DeSigNeD for eACh AppliCATioN

Every RAVENTM trim is custom designed to meet the needs to

the toughest liquid, steam and gas services in the Oil and Gas,

Petrochemical, Power and Process industries meeting NACE

MR0175 where necessary. The number o pressure reducing

stages is governed by two actors: velocity control and noise

requirements. Either velocity or noise can be the actor determining

the number o stages required. As per the latest ISA guidelines,

RAVENTM is designed to control velocity o the uid within the trim

to 100 t./sec. (30m/s) (or the equivalent velocity head in case

o gases). Dependent upon the dierential pressure across the

trim, the stages required to control the velocity are calculated. The

lower the noise specifcation, the more stages required. The trim is

also characterized to account or changes in ow and dierential

pressure at dierent valve openings.

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SPX Flow Technology 5620 West Road, McKean, PA 16426

P: (814)476-5800 F: (814)476-5854 E: cv@spx.com

SPX reserves the right to incorporate our latest design and material changes without notice or obligation. Design eatures, materials o construction and dimensional data, as

described in this bulletin, are provided or your inormation only and should not be relied upon unless confrmed in writing. Please contact your local sales representative or product

availability in your region. For more inormation visit www.spx.com.

The green > is a trademark o SPX Corporation, Inc.

ISSUED 06/2012 CV-1160T-US COPYRIGHT 2012 SPX Corporation

6 Turns

12 Turns

18 Turns

6 Turns

12 Turns

18 Turns

preSSure Drop fluiD VeloCiTy VS. STAgeS of preSSure Drop

P SI 1 St age 3 Stages 4 St ages 6 St ages 10 Stages 16 St ages

500 220 fps 130 fps 100 fps

1000 311 fps 184 fps *** 100 fps

2000 440 fps 260 fps *** ** * 100 fps

4000 622 fps 368 fps *** ** * *** 100 fps

SerViCe CoNDiTioNS

ki NeTiC eNe rgy CriTeriA equiVAleNT WATer VeloCiTy

pSiA kpA fT/SeC M/S

Cont inuous Serv ice, S ingle Phase F lu ids 70 450 100 30

Cavi t a t ing and Mul t i Phase F lu id Out le t ( f lash ing) 40 275 75 23

Vibrat ion Sens i t i veSystem 11 75 40 12

rAVeNTM TriM DeSigN CriTeriA

rAVeNTM proViDeS Tru e VeloCiTy CoNTrol

Copes-Vulcans RAVENTM Control Valves oer a proven solution or

severe service applications where a true velocity control trim is the

best, or possibly the only, answer. The combined eect o numerous

narrow ow channels, each with many sharp turns and a continually

expanding ow path, is to remove kinetic energy rom the uid while

gradually lowering its pressure. By limiting the uid velocities inside

the valve, RAVENTM trim precludes problems typically associated

with high velocity such as erosion, noise, vibration and poor control.

Ve loCiTy CoNTrol: S e leCT ioN of STAg e S

Flow can be either over or under the plug depending upon the uid,

the service and, in some instances, the piping confguration.

Equipped with various plugs (eg. unbalanced, balanced, tandem,

etc.), RAVENTM can provide shuto classes ranging rom ANSI/FCI

70-2 Class IV to VI and MSS-SP-61. For particular applications

Copes-Vulcan can also supply our patented ZERO leakage design.

Quick-change design with no threaded or welded-in parts. Seat

ring is a separate replaceable item.

A pressure-balancing groove inboard o the I.D. o each disc allows

the plug to be completely balanced around its circumerence, and

provides a landing area or entrained debris, thus precluding plug

galling. Additionally, bypasses in the ow path allow or entraineddebris to clear the main uid ow path.

The additional beneft or liquid ow is the elimination o cavitation

and the damage it can do to a valve, its trim, and the downstream

piping.

Due to the velocity control techniques utilized

in RAVENTM, vibration can be virtually eliminated. High velocity is a

root cause o noise and vibration, which oten can cause seal ailure,

instrumentation problems and cracking o valve components.